UltraBoost 21 UB21 – S23840

Short Description
Feel the energy in every stride with the UltraBoost 21 UB21 S23840 — a cutting-edge fusion of innovation, comfort, and timeless design. Engineered with a Primeknit+ upper and a full-length BOOST midsole, this running icon delivers unbeatable responsiveness and all-day support. ⚡👟

Key Features
👟 Silhouette: UltraBoost 21 (Unisex / Running Shoe)
🧵 Primeknit+ upper provides adaptive support, lightweight feel, and superior breathability
💨 BOOST midsole delivers maximum cushioning and energy return
🦶 Stretchweb outsole with Continental™ rubber ensures top-tier grip and durability
🎯 Linear Energy Push system enhances stability and forward propulsion
🌿 Constructed with recycled materials for a sustainable running experience

Specifications
🆔 Style code: S23840
🎨 Color: Core Black / Cloud White / Grey Six
⬆️ Low-top performance running silhouette
📦 Packaged in official Adidas Originals box

Size & Fit
📏 Fits true to size for most runners
🧠 For extra room, consider sizing up by half a size

Care
🧼 Wipe gently using mild soap and a soft brush or cloth
🌬️ Air dry naturally — avoid direct sunlight or heat